So I suppose my fourier knowledge is a little bit rusty. Any help would be greatly appreciated.(adsbygoogle = window.adsbygoogle || []).push({});

http://pmgz.net/3259.jpg

How do they get from the original DKS equation to the fourier space DKS equation (from eq 1 to eq 2)?

Thanks greatly for any help.

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# Fourier trouble in PDE

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